Selvage portion gripping device for loom, loom, and method of manufacturing woven fabric

ABSTRACT

A device is capable of reducing occurrence of cloth fell retreat at a selvage portion of a woven fabric and warp yarn looseness in a base cloth selvage portion when a high-density woven fabric is woven at a high speed. The selvage portion gripping device for a loom has a space where a selvage portion can pass in which the selvage portion formed by weaving additional yarns and weft yarns can pass through in a woven fabric forwarding direction, a small space where the weft yarn can move in which the weft yarn can move in the woven fabric forwarding direction, and a means to maintain a woven condition of the selvage portion even when the weft yarn is cut with a weft yarn cutter.

TECHNICAL FIELD

This disclosure relates to a selvage portion gripping device for a loom.More specifically, the disclosure relates to a selvage portion grippingdevice for a loom that effectively suppresses occurrence of warp yarnlooseness in a base cloth selvage portion that occurs near a selvageportion when a high-density woven fabric is woven, a loom equipped withthe device, and a method of manufacturing the woven fabric using thedevice.

BACKGROUND

Conventionally, there have been proposed a large number of high-densitywoven fabrics using a synthetic fiber multifilament including polyesterand nylon. Due to diversification of uses, a woven fabric that isfurther made thin or is highly strengthened accompanying thisdiversification has been requested.

Generally, when the high-density woven fabric is woven, as a coverfactor thereof becomes larger, an amount of movement of a cloth fellfrom a reed beating portion to a forwarding side of a warp yarn becomeslarger. Because of this, the following inconveniences occur.

-   -   It should be noted that the cover factor is a value expressed by        (D1×0.9)^(1/2)×N1+(D2×0.9)^(1/2)×N2, wherein total fineness of a        warp yarn is D1 (dtex), warp yarn density is N1 (yarns/2.54 cm),        total fineness of a weft yarn is D2 (dtex), and weft yarn        density is N2 (yarns/2.54 cm.    -   (a) The woven fabric near the reed beating portion undergoes a        bumping phenomenon, and it becomes hard to obtain a woven fabric        having a desirable weft yarn density.    -   (b) The warp yarn induces fluff and weaving cannot be stably        performed.    -   (c) When a loom rotation speed is made high, a phenomenon in        which the amount of movement of the cloth fell of the selvage        portion from the reed beating portion to the forwarding side of        the warp yarn becomes larger appears more conspicuously. Due to        warp yarn looseness at the selvage portion, a cloth length        difference between the selvage portion and a central portion        occurs, and a waving phenomenon, that is, a so-called warp yarn        looseness in a base cloth salvage portion (also referred to as        “Mimitarumi” or “Mimitaburi” in Japanese) appears. The woven        fabric is formed into a desirable product by cutting and sewing.        To effectively utilize the woven fabric to the maximum for a        target use, the woven fabric is usually used up to near an end        portion of the woven fabric. Ends of a cut part easily unravel.        Accordingly, when the warp yarn looseness in the base cloth        selvage portion occurs near the selvage portion, poor cutting        occurs, a shape as a product cannot be secured, or a function is        not fulfilled.    -   (d) The warp yarn looseness in the base cloth selvage portion in        a gray fabric not only hinders each processing passing property        of a roll winding process, a scouring process, and a heat set        process, but also becomes a cause for creating wrinkles on the        obtained woven fabric.

As a technology to suppress occurrence of warp yarn looseness in thebase cloth selvage portion, a method in which weaving density of aselvage portion is made higher than weaving density of a main body partof a woven fabric at the time of weaving (Japanese Patent Laid-openPublication No. H09-302549), a method in which additional yarns arebeaten up into a selvage portion formed of ground yarns and bindingyarns (Japanese Patent Laid-open Publication No. H09-302550), a methodin which a binding yarn having a hetero-cross-section is used for a partof a plurality of additional yarns provided at an outside of the wovenfabric (Japanese Patent Laid-open Publication No. 2001-355143), a methodin which a section shape of a warp yarn at a selvage portion is madeflat (Japanese Patent Laid-open Publication No. 2003-221749), and thelike are known. However, it cannot be always said that thesetechnologies are capable of sufficiently suppressing occurrence of thewarp yarn looseness in the base cloth selvage portion.

Apart from the above-described technologies, a method in which, by anair jet loom or a water jet loom, a pair of grip rollers is provided atan arrival portion of a running weft yarn, tension for breaking the weftyarn running is applied to the weft yarn for a predetermined time untilreed beating of a cloth fell is completed, and spring back of the warpyarn is held down (Japanese Patent Laid-open Publication No. H10-46445),and a method in which a device which tightens a weft yarn similarlyprovided at an arrival portion of a weft yarn is driven and controlled(Japanese Patent Laid-open Publication No. H10-298850) are known.

However, the above-described conventional technologies have a problem inthat complicated control is required to grip the running weft yarn,which thereby leads to an increase in cost of manufacturing the wovenfabric.

In consideration of the drawbacks of the above-described conventionaltechnologies, it could be helpful to provide a selvage portion grippingdevice for a loom capable of effectively suppressing occurrence of clothfell retreat at a selvage portion or warp yarn looseness in a base clothselvage portion when a high-density woven fabric is woven at a highspeed, a loom, and a method of manufacturing the woven fabric.

SUMMARY

We thus provide:

-   -   (1) A selvage portion gripping device to be mounted on a loom,        the selvage portion gripping device including: a space where a        selvage portion can pass in which the selvage portion formed by        weaving additional yarns and weft yarns can pass through in a        woven fabric forwarding direction; a tiny space where the weft        yarn can move in which the weft yarn can pass through; and a        means for maintaining a woven condition of the selvage portion        even when the weft yarn is cut with a weft yarn cutter of the        loom.    -   (2) The selvage portion gripping device for the loom, wherein        the means for maintaining the woven condition of the selvage        portion is a flexible part which catches the selvage portion        allocated in the space where the selvage portion can pass.    -   (3) The selvage portion gripping device for the loom according        to claim 2, wherein the flexible part which catches the selvage        portion is a part formed of a plate spring or a flexible member        and a plate material.    -   (4) A loom having any of the selvage portion gripping devices        for the loom, wherein the selvage portion gripping device exists        at a selvage portion of a woven fabric and at a position where a        weft yarn is cut with a weft yarn cutter.    -   (5) A method of manufacturing a woven fabric where a        predetermined number of warp yarns are parallelized, additional        yarns are parallelized at an outside of the parallelized warp        yarns, and a weft yarn is supplied to the warp yarns and the        additional yarns, including: by using the loom, gripping a        selvage portion by a selvage portion gripping device for a loom        which exists on the loom at the time of cutting the weft yarn.    -   (6) The method of manufacturing the woven fabric, includes:        gradually separating the additional yarns from the selvage        portion discharged from the selvage portion gripping device for        the loom.    -   (7) A method of manufacturing a woven fabric where a        predetermined number of warp yarns are parallelized, additional        yarns are parallelized at an outside of the parallelized warp        yarns, and a weft yarn is supplied to the warp yarns and the        additional yarns, including: after the weft yarn is supplied and        the woven fabric is subjected to reed beating, gripping a        selvage portion formed by weaving the additional yarns and the        weft yarns at the time of cutting the weft yarn.

When weaving is performed by using the selvage portion gripping devicefor the loom, the selvage portion is disposed inside the selvage portiongripping device and configured to maintain the woven condition thereof.Accordingly, occurrence of crimp of the weft yarn can be prevented,looseness of the warp yarn can be prevented, and warp yarn looseness ina base cloth selvage portion can be effectively suppressed. Similarly,when weaving is performed by using the selvage portion gripping devicefor the loom, the selvage portion inside the selvage portion grippingdevice for the loom is flexibly caught by the flexible part whichcatches the selvage portion. Accordingly, forwarding of the selvageportion is performed more smoothly, and the woven condition between theadditional yarns and the weft yarns are maintained more reliably.Consequently, occurrence of the crimp of the weft yarn can be prevented,the looseness of the warp yarn can be prevented, and the warp yarnlooseness in the base cloth selvage portion can be effectivelysuppressed.

Further, when weaving is performed by using the selvage portion grippingdevice for the loom, the flexible part which catches the selvage portionis a part formed of a plate spring or a flexible member and a platematerial. Accordingly, a structure is simple and inexpensive, forwardingof the selvage portion is performed more smoothly, and the wovencondition between the additional yarns and the weft yarns is maintainedfurther reliably. Consequently, occurrence of cloth fell retreat at theselvage portion of the woven fabric and the warp yarn looseness in thebase cloth selvage portion can be suppressed more effectively andinexpensively.

When weaving is performed by using the loom, weaving can be performedwhile occurrence of cloth fell retreat at the selvage portion of thewoven fabric or the warp yarn looseness in the base cloth selvageportion is suppressed more effectively.

Further, according to the weaving method, the selvage portion isdisposed inside the selvage portion gripping device and is configured tomaintain the woven condition thereof. Accordingly, it is possible toobtain a woven fabric in which occurrence of the crimp of the weft yarncan be prevented, the looseness of the warp yarn is prevented, and warpyarn looseness in the base cloth selvage portion is effectivelysuppressed.

The additional yarns are separated from the selvage portion dischargedfrom the selvage portion gripping device together with the movement ofthe woven fabric. Accordingly, cutting work of the selvage portion isnot required, and the selvage portion can be reused by winding theadditional yarns separately.

Further, according to the weaving method, the selvage portion isconfigured to maintain the woven condition thereof. Accordingly, it ispossible to obtain a woven fabric in which occurrence of the crimp ofthe weft yarn can be prevented, the looseness of the warp yarn isprevented, and the warp yarn looseness in the base cloth selvage portionis effectively suppressed.

In the weaving method, the weaving is performed by a loom which usesfluid to insert the weft yarn such as a water jet loom, the selvageportion gripping device for the loom is installed at a side of a weftyarn nozzle which is a nozzle for beating the weft yarn, and even whenthe weft yarn is cut between the weft yarn nozzle and the selvageportion gripping device for the loom with a weft yarn cutter, theselvage portion is disposed inside the selvage portion gripping deviceand is configured to maintain the woven condition thereof. Accordingly,occurrence of the crimp of the weft yarn can be prevented, the loosenessof the warp yarn can be prevented, and the warp yarn looseness in thebase cloth selvage portion can be effectively suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic plan view showing a main part of a loom whichincludes a selvage portion gripping device for a loom.

FIG. 2 is a schematic perspective view showing the selvage portiongripping device for the loom.

FIG. 3 is a schematic sectional view of the selvage portion grippingdevice for the loom which uses a pair of plate springs as a flexiblepart which catches a selvage portion.

FIG. 4 is a schematic sectional view of the selvage portion grippingdevice for the loom which uses the pair of plate springs as the flexiblepart which catches the selvage portion.

FIG. 5 is a diagram showing an evaluation method of warp yarn loosenessin a base cloth selvage portion.

DESCRIPTION OF REFERENCE SIGNS

-   1: Warp yarn-   2: Additional yarn-   3: Reed-   4: Weft yarn nozzle-   5: Weft yarn-   6: Weft yarn cutter-   7: Selvage portion gripping device for loom-   8: Fringe-   9: Edge dent of reed-   10: Woven fabric-   11: Selvage portion-   71A: Inlet of space where selvage portion can pass-   71B: Outlet of space where selvage portion can pass-   72A: Tiny space where weft yarn can move and which is allocated at    weft yarn nozzle side-   72B: Tiny space where weft yarn can move and which is allocated at    woven fabric side-   73: Bolt-   74A, 74B: Plate springs-   75A, 75B: Plate spring supporting bodies-   101A: End portion allocated at weft yarn nozzle side of woven fabric-   101B: End portion allocated at side which is not weft yarn nozzle    side of woven fabric-   102A, 102B: Marks at central portions of woven fabric-   103A, 103B: Lines along weft yarn-   104A, 104B: Lines along warp yarn-   L, R: Strips-   X: Direction of weft yarn-   Y: Direction of warp yarn

DETAILED DESCRIPTION

Hereinafter, examples will be described by using drawings and the like.

A selvage portion gripping device for a loom is a selvage portiongripping device for a loom which has a space where a selvage portion canpass in which the selvage portion formed by weaving an additional yarnand a weft yarn can pass through in a woven fabric forwarding directionand a tiny space where a weft yarn can move in which the weft yarn canmove in the woven fabric forwarding direction. The selvage portiongripping device further has a means that maintains a woven condition ofthe selvage portion even when the weft yarn is cut with a weft yarncutter.

It should be noted that a fringe is a weft yarn supplied from a weftyarn nozzle, and then cut and protruded from the woven fabric. Theadditional yarn is a yarn inserted into an outside of the woven fabricin a warp direction to catch the fringe apart from a ground yarn of thewoven fabric. Since the weft yarns are weft-inserted into the additionalyarns as with the warp yarns, a condition in which the additional yarnsand the weft yarns are intersected by vertically changing theirpositions, i.e., a woven condition, is formed. The selvage portion is aportion where the fringes and the additional yarns are woven.

FIG. 1 is a schematic plan view showing an outline of weaving when theselvage portion gripping device for the loom is installed at a weft yarnnozzle side. “1” indicates a warp yarn, “2” indicates an additionalyarn, “3” indicates a reed, “4” indicates a weft yarn nozzle, “5”indicates a weft yarn, “6” indicates a weft yarn cutter, “7” indicates aselvage portion gripping device for a loom, “8” indicates a fringe, and“9” indicates an edge dent of the reed. It should be noted that, in theweaving, a plurality of warp yarns further exists and the weft yarn 5and the reed 3 are further extended at a right side in FIG. 1. However,the illustration is omitted.

The weft yarn 5 supplied from the weft yarn nozzle 4 is weft-insertedinto the additional yarns 2 supplied from a device which supplies theadditional yarns (not shown) and into the warp yarns 1 supplied from adevice which supplies the warp yarns (not shown). The weft yarn 5weft-inserted into the warp yarns 1 is beaten up by the reed 3 and theedge dent of the reed 9, and a woven fabric 10 and a selvage portion 11are formed. It should be noted that a tip of the beaten weft yarn 5 isnormally caught by catch-cords (not shown) or the like, and weft yarntension is maintained for a predetermined time. After that, the tip ofthe weft yarn 5 is cut between the woven fabric 10 and the catch-cordswith a cutter allocated at an opposite side of the weft yarn nozzle (notshown), and the catch-cords are collected.

The selvage portion 11 where the additional yarns 2 and the weft yarns 5are woven is supplied to the selvage portion gripping device for theloom 7 without being reed-beaten, and is moved inside the selvageportion gripping device synchronously with movements of the woven fabric10 and the fringes 8. At this time, the weft yarn 5 is cut with the weftyarn cutter 6 immediately after the reed beating. However, the selvageportion 11 after the weft yarn is cut is disposed inside the selvageportion gripping device, and the woven condition is maintained.Accordingly, occurrence of crimp of the weft yarn or occurrence oflooseness of the warp yarn can be prevented.

The selvage portion 11 after the weft yarn have been cut is dischargedfrom the selvage portion gripping device as it is, and is moved togetherwith the woven fabric 10. However, since the selvage portion 11 isdischarged from the selvage portion gripping device for the loom, thewoven condition of the additional yarns 2 and the fringes 8 is notmaintained. The fringes 8 are gradually separated from the additionalyarns 2 and move. The additional yarns 2 move independently. Further,the woven fabric 10 and the fringes 8 move together. The additionalyarns 2 are collected in the same route as that of the catch-cordsallocated at the opposite side of the weft yarn nozzle through a guide(not shown) or by another winding device. With this mechanism, the crimpof the weft yarn after the weft yarn is cut and looseness of the warpyarn are not generated, and occurrence of cloth fell retreat at theselvage of the woven fabric or warp yarn looseness in the base clothselvage portion is effectively suppressed.

To make it difficult to generate the crimp of the weft yarn and thelooseness of the warp yarn, a length for gripping the selvage portion(i.e., a length in a longitudinal direction of the woven fabric wherethe selvage portion is held down by the means that maintains the wovencondition of the selvage portion of the woven fabric, and hereinafterreferred to as “selvage portion gripping length”) is preferably 2 to 15mm, and more preferably 3 to 10 mm. By having this range, high tensioncan be maintained even when the weft yarn is cut after the reed beating,and a woven fabric structure can be stabilized.

It is preferable that a width to grip the selvage portion (i.e., alength in a direction vertical to the longitudinal direction of thewoven fabric where the selvage portion gripping device for the loomgrips the selvage portion (a direction where the additional yarns whichform the selvage portion are arranged), and hereinafter referred to as“selvage portion gripping width”) be a width capable of gripping theentire selvage portion. However, the width is not limited to theabove-described width as long as the high tension can be maintained evenwhen the weft yarn is cut after the reed beating to stabilize the wovenfabric structure.

The selvage portion gripping device for the loom is only disposed at theweft yarn nozzle side of the woven fabric 10. However, the device may bedisposed at the opposite side of the weft yarn nozzle. When the selvageportion gripping device for the loom is disposed at the opposite side ofthe weft yarn nozzle, it is preferable that the device be providedbetween the woven fabric and the weft yarn cutter allocated at theopposite side of the weft yarn nozzle. At that time, similarly to theweft yarn nozzle side, it is preferable that the additional yarns beparallelized at the opposite side of the weft yarn nozzle of the wovenfabric, that the selvage portion woven with the beaten weft yarns beformed, and that the selvage portion gripping device for the loom bedisposed near a reed beating portion of the selvage portion. It is morepreferable that the selvage portion gripping device for the loomallocated at the side of the weft yarn nozzle and the selvage portiongripping device for the loom allocated at the opposite side of the weftyarn nozzle be disposed opposite to each other via the warp yarns of thewoven fabric to maintain weft yarn tension.

FIG. 2 is an enlarged schematic perspective view of when the selvageportion gripping device for the loom 7 is installed at the weft yarnnozzle 4 side. “1” indicates the warp yarn, “2” indicates the additionalyarn, “4” indicates the weft yarn nozzle, “5” indicates the weft yarn,“8” indicates the fringe, “10” indicates the woven fabric, and “11”indicates the selvage portion. The woven fabric 10 is forwarded from aright upper side in the drawing to a left lower side in the drawing.Further, the plurality of warp yarns further exists and the weft yarn 5is further extended at a right upper portion in the drawing. However,the illustration is omitted.

It is desirable that the selvage portion gripping device for the loom 7be provided at least at the weft yarn nozzle side of the woven fabric10. In addition, it is preferable that the device 7 be further providedat the opposite side of the weft yarn nozzle.

The selvage portion gripping device for the loom 7 includes an outlet71B of the selvage portion of a space where the selvage portion can passin which the selvage portion 11 formed by weaving the additional yarns 2and the weft yarns 5 can pass through in the woven fabric forwardingdirection and an inlet 71A (not shown) of the selvage portion of thespace where the selvage portion can pass formed at upper reaches of theadditional yarns 2 of the selvage portion gripping device for the loom7. An outlet 72B of the selvage portion is a tiny space portion wherethe weft yarn can move and which is at the woven fabric side for whichthe fringes 8 move parallel to the forwarding direction of the wovenfabric 10. A tiny space where the weft yarn can move and which isallocated at the weft yarn nozzle side 72A (not shown) is formed at theweft yarn nozzle side of the selvage portion gripping device for theloom 7.

The selvage portion 11 enters the space portion where the selvageportion can pass from the inlet 71A of the space where the selvageportion can pass along the forwarding direction of the woven fabric 10.The fringes 8 are gripped by a gripping means provided between the tinyspace where the weft yarn can move and which is allocated at the weftyarn nozzle side 72A and the tiny space where the selvage portion canmove and which is allocated at the woven fabric side 72B. The fringes 8move inside the space where the selvage portion can pass parallel to theforwarding direction of the woven fabric 10. Even when the weft yarn 5is cut with the weft yarn cutter between the weft yarn nozzle 4 and theselvage portion gripping device for the loom 7, the woven condition ofthe selvage portion is maintained.

As the means to maintain the woven condition of the selvage portion 11within the selvage portion gripping device for the loom, a slidingmember which does not prevent movement of the selvage portion in thespace where the selvage portion can pass can be cited. A method in whicha dimension of the space where the selvage portion can pass isappropriately set according to a dimension of the selvage portion to becapable of gripping the selvage portion 11 can be employed. However, amethod in which a flexible part which catches a selvage portion whichflexibly catches the selvage portion is arranged in the space whereselvage portion can pass of the selvage portion gripping device for theloom is simpler and more reliable.

In this case, the flexible part which catches the selvage portion isprovided inside the space where selvage portion can pass. As theflexible part which catches the selvage portion, a rubber plate or aresin plate can be used, or a member formed of a flexible member such asa coil spring or a rubber, and a plate material made of a metal or thelike can be used. Further, it is advantageous to use a fixed platespring in the space where the selvage portion can pass in terms of astructure and simplicity, i.e., cost. Also, it is preferable that aportion of the flexible part which catches the selvage portion which isin contact with the selvage portion have a surface having a low abrasionproperty.

FIG. 3 is a schematic sectional view of the selvage portion grippingdevice for the loom which uses a pair of plate springs 74A, 74B as theflexible part which catches the selvage portion. FIG. 3 corresponds to acase where the device is taken along a surface orthogonal to the weftyarns 5 in FIG. 2.

The woven fabric is forcibly taken off by a winding roll in the weaving.Accordingly, in a condition where the additional yarns 2 and the weftyarns 5 are woven, the selvage portion 11 is moved from a right side toa left side in the drawing, i.e., from the inlet 71A of the space wherethe selvage portion can pass to the outlet 71B of the space where theselvage portion can pass. “74A” and “74B” indicate a pair of carbonsteel catching parts such as plate springs, provided inside the spaceportion where the selvage portion can pass, and are respectively fixedto upper and lower wall surfaces of the space portion where the selvageportion can pass by two bolts 73. There, the selvage portion 11 providedin the space portion where the selvage portion can pass is caught by theplate springs 74A, 74B serving as the flexible selvage portion partsfrom the upper and lower surfaces. Even when the weft yarn 5 is cutbetween the weft yarn nozzle 4 and the selvage portion gripping devicefor the loom 7, the cut weft yarn 5 is prevented from slipping out fromthe selvage portion 11 or from loosening, and the woven condition of theselvage portion 11 is maintained inside the selvage portion grippingdevice for the loom 7. The selvage portion 11 is moved inside the spaceportion where the selvage portion can pass and discharged from theselvage portion gripping device for the loom 7. The woven fabric 10 ismoved together with the fringes 8. At this time, as described above, thewoven condition between the additional yarns 2 and the cut fringes 8 areloosened, the cut fringes 8 are gradually separated from the additionalyarns 2, and the additional yarns 2 move independently and are separatedfrom the woven fabric 10 and the fringes 8.

It is not always necessary that the flexible part which catches theselvage portion is formed in a pair. One plate spring disposed on theupper (or the lower) wall surface and a lower side (or an upper side)thereof inside the selvage portion passage section may be provided. Theplate spring can employ various shapes. However, to catch the selvageportion by uniform stress over a constant length, as in FIG. 3, it ispreferable to use the pair of plate springs 74A, 74B which respectivelyhas a planar shape and two arc shapes at both ends thereof. Byconsidering the number of the additional yarns which configures theselvage portion and a thickness of each additional yarn, a thickness ofthe selvage portion, and the like, a length or a width of a portionhaving the planar shape, a thickness of the plate spring, and the likemay be appropriately set. Accordingly, the woven condition of theselvage portion can be maintained in a degree that the crimp of the weftyarn after the weft yarn is cut or the looseness of the warp yarn is notgenerated at the selvage portion discharged from the selvage portiongripping device 7. Further, as the material, stainless steel, phosphorbronze, beryllium copper, resin, or the like can be employed as well asthe carbon steel.

FIG. 4 is a schematic sectional view of the selvage portion grippingdevice for the loom 7 shown in FIG. 3 which is taken along a surfaceorthogonal to a forwarding direction of the additional yarns 2. In thisdrawing, “72A” indicates the tiny space where the weft yarn can move forthe weft yarn at the weft yarn nozzle side (before cutting and aftercutting) to move together with the selvage portion, and “72B” indicatesthe tiny space where the weft yarn can move for the weft-inserted weftyarn 5 to move in the forwarding direction of the woven fabric 10. Thesetiny space where the weft yarn can move 72A, 72B can adjust a clearanceso that the weft yarn can pass through and a woven portion between theadditional yarns and the weft yarns in the woven condition (i.e., theselvage portion) cannot pass through. Accordingly, even when the weftyarn is cut at the weft yarn nozzle side, the woven condition ismaintained, and there is no occurrence of a crimp of the weft yarncaused by slipping-out or looseness of the cut weft yarn or nooccurrence of a loosen fringe caused by the looseness of the warp yarn.Therefore, it is preferable that a height of the tiny space where theweft yarn can move be smaller than heights of the inlet and the outletof the space portion where the selvage portion can pass.

Typically, the woven fabric woven by using the selvage portion grippingdevice for the loom is particularly useful when weaving a high-densitywoven fabric used for sportswear, industrial materials or the like.However, this disclosure is not limited to this.

The yarn for the warp yarn or the weft yarn used for weaving is notparticularly limited, and a chemical fiber, a natural fiber or the likecan be used. As the chemical fiber, for example, a polyamide-basedfiber, a polyester-based fiber, an aramid-based fiber, a rayon-basedfiber, a polysulfone-based fiber, a super high molecular weightpolyethylene-based fiber or the like can be used. As the natural fiber,cotton, hemp, silk, wool, or the like can be used. In weaving thehigh-density woven fabric, the chemical fiber is preferable. Amongthese, the polyamide-based fiber and the polyester-based fiber which areexcellent in mass productivity and economy are preferable. Thepolyamide-based fiber is further preferable from a viewpoint of heatresistance and less fluff of the fiber.

As the polyamide-based fiber, for example, fibers made of Nylon 6, Nylon66, Nylon 12, Nylon 46, a copolymerized polyamide of the Nylon 6 and theNylon 66, copolymerized polyamides formed by copolymerizing the Nylon 6with polyalkylene glycol, dicarboxylic acid, amine and the like can becited. Further, as the polyester-based fiber, for example, fibers madeof polyethylene terephthalate, polybutylene terephthalate,polytrimethylene terephthalate and the like can be cited. A fiber formedby copolymerizing the polyethylene terephthalate or the polybutyleneterephthalate with isophthalic acid, or 5-sodium sulfoisophthalic acidas an aromatic dicarboxylic acid component, or a fiber formed bycopolymerizing the polyethylene terephthalate or the polybutyleneterephthalate with aliphatic dicarboxylic acid such as adipic acid, maybe used as well.

Further, to improve productivity in a spinning and stretching processand a processing process or to improve characteristics, these syntheticfibers may contain an additive such as a heat stabilizer, anantioxidant, a light stabilizer, a smoothing agent, an antistatic agent,a plasticizer, a thickener, a pigment, a flame retardant and the like.

Further, as a form of the fiber, a multifilament yarn is preferably usedfrom a point of significantly achieving the desired effects.

Further, a sectional shape of a single yarn is not limited to a roundshape and may be formed in any shape. For example, needless to say, thesectional shape may be a laterally symmetrical shape such as a flatshape, a rectangular shape, a rhomboid, or a cocoon shape, or alaterally asymmetrical shape. Alternatively, the sectional shape may bea shape combining any of these. Further, the sectional shape may have aprotrusion or unevenness. The yarn may be a hollow yarn.

A plain weave, a twill weave, a satin weave, a variation of theseweaves, and the like can be used for the woven fabric manufactured byusing the selvage portion gripping device for the loom. However, thisdisclosure is not particularly limited to these weaves.

The woven fabric manufactured by using the selvage portion grippingdevice for the loom is woven using the warp yarn, the weft yarn, and theadditional yarn as basic yarns. The additional yarn catches the weftyarn by utilizing its rigidity and prevents looseness of the weft yarn.The additional yarn forms the selvage portion by weaving with the weftyarn.

A predetermined number of the warp yarns are parallelized, and theadditional yarns are further parallelized at the outside of theparallelized warp yarns. The weft yarn is supplied and beaten up, andthe woven fabric is manufactured. As described above, after the wovencondition between the supplied weft yarns and the additional yarns ismaintained near the reed beating portion of the selvage portion by theselvage portion gripping device for the loom, the selvage portion isdischarged from the selvage portion gripping device for the loom of thewoven fabric. In other words, near the reed beating portion of theselvage portion, the selvage portion gripped by the selvage portiongripping device for the loom is moved synchronously with the movement ofthe woven fabric inside the selvage portion gripping device for theloom, and discharged thereafter.

The discharged selvage portion is moved together with the movement ofthe woven fabric. As mentioned above, since the additional yarns aregradually separated from the portion of the selvage portion where theweft yarn is cut, the finished woven fabric does not include theadditional yarns. In other words, the additional yarn is supplied from asupply device different from the warp yarn. While the warp yarns arepassed through healds and reeds, the additional yarns are not passedthrough the reeds. The additional yarns form the selvage portiontogether with the weft yarns woven by opening movements similar to thewarp yarns, and are passed through the selvage portion gripping devicefor the loom. The additional yarns are supplied from the vicinity of awarp yarn beam, a load is applied to the additional yarns by a springtype tensioner, and the additional yarns are passed through the openedhealds. After the weft yarn is run by high-pressure water or pressuredair and the warp yarn and the weft yarn are beaten up by the reed, theweft yarn is cut with the weft yarn cutter. Since the selvage portiongripping device for the loom grips the selvage portion to maintain thewoven condition of the selvage portion, slipping-out of the cut weftyarn from the selvage portion or looseness thereof is suppressed. Withthis configuration, compared with a case where the selvage portiongripping device for the loom is not installed, the crimp of the weftyarn of the selvage portion becomes small, and the crimp of the warpyarn becomes large. Due to this, warp yarn tension becomes high,gripping force for the weft yarn increases, and the cloth fell retreatat the selvage portion becomes small. Hence, since a cloth lengthdifference between the selvage portion and a central portion of thewoven fabric becomes small, an amount of a bow becomes small, and thewarp yarn looseness in the base cloth selvage portion can improve.

When weaving is performed according to the conventional method, thecloth fell is expressed by a distance from a top of a temple to thecloth fell. When the weft yarn is run by the high-pressure water or thepressured air, high tension acts on the weft yarn. When the weft yarn iscut with the cutter after the weft yarn is beaten up by the reed, thefree end portion of the weft yarn returns to a ground side of the wovenfabric. Due to the decline in the weft yarn tension at the selvageportion of the woven fabric, the crimp of the weft yarn increases, andconversely the crimp of the warp yarn at the selvage portion decreases.Accordingly, the warp yarn tension at the selvage portion becomes low.As a result, the gripping force exerted on the weft yarn by the warpyarns disappears, and the cloth fell retreat becomes large. Also, theamount of a bow of the woven fabric increases, which thereby leads tooccurrence of the warp yarn looseness in the base cloth selvage portionor deterioration of physical properties of the woven fabric. However, byperforming weaving by using the selvage portion gripping device for theloom, the above-described problems are solved.

When weaving is performed by using the selvage portion gripping devicefor the loom, the additional yarns are normally supplied from a cone ora paper tube without using a leno yarn device or a bobbin. Particularly,it is preferable to use a spring washer to manage the tension when theadditional yarns are supplied.

Since moderate crimping lessens fluctuations in tension of theadditional yarns during weaving, it is preferable that the additionalyarn be a multifilament and a crimped yarn. A material of the additionalyarn is not particularly limited. However, polyester or nylon is easilyavailable in general. It is preferable to select the material of theadditional yarn similar in yarn characteristics to the warp yarn.

It is preferable that total fineness of the additional yarns be largerthan total fineness of the weft yarns. By keeping woven strength betweenthe additional yarns and the weft yarns at the selvage portion largerthan woven strength between the warp yarns and the weft yarns,slipping-out of the cut weft yarn from the selvage portion or looseningthereof is prevented.

From a viewpoint of exhibiting the desired effects to the maximum, it ispreferable that the number of additional yarns be four to eight yarns.

Since the woven fabric using the selvage portion gripping device for theloom can be subjected to high-speed operation, it is preferable that thewoven fabric be woven by a jet loom. Particularly, a water jet loom ispreferable from a point of conspicuously exhibiting the desired effects.The water jet loom runs the weft yarns by the high-pressure water, beatsup the weft yarns, and then cuts the weft yarns at the weft yarn nozzleside. Because of this, compared to an air jet loom or a rapier loom, thewater jet loom tends to have high running tension of the weft yarns, andfurther improvement of gripping force of the weft yarn at the selvageportion is requested. Accordingly, at the time of high-speed operationor a wide woven fabric in particular, the effect obtained by use of theadded yarns (additional yarns) and by the selvage portion grippingdevice for the loom becomes more conspicuous.

When the high-density woven fabric is woven by using the selvage portiongripping device for the loom, it is preferable that, after the weavingby the water jet loom, scouring/heat set processing be performed to dryand/or remove an oil agent adhered to original yarns and removewrinkles.

A width of the woven fabric is not particularly limited. However, sincethe warp yarn looseness in the base cloth selvage portion easily occursas the woven fabric is wider, the device is particularly useful for thewoven fabric having a region where only the warp yarns exist of 140 cmor more, and particularly of 180 cm or more. It is preferable that anupper limit of the width be 280 cm or less in manufacturing.

Next, a method of weaving using the selvage portion gripping device forthe loom will be described.

The above-described yarns are used for the warp yarns, the additionalyarns, and the weft yarns. The warp yarns and the additional yarns whosefineness is in proportion to woven fabric design are arranged for thewarp and set in the loom. The weft yarns are prepared in the samemanner. The additional yarn to be used is normally thicker than the warpyarn. As for the loom, it is preferable to use the water jet loom from apoint of reducing occurrence of warp yarn fluff or improvingproductivity.

The tension of the warp yarn and the additional yarn is preferably 10 to250 cN/yarn, and more preferably 20 to 200 cN/yarn. By setting thetension in such a range, a tiny space between single fibers in a yarnbundle of the yarns that configures the woven fabric can be reduced, anda dense woven fabric can be obtained. Further, after the weft yarn isinserted, the warp yarns tensioned as described above force the weftyarn to bend so that structure-restraining force of the woven fabric inthe weft yarn direction is enhanced, an anti-yarn slippage property ofthe woven fabric improves, and a seam portion of a sewn product can bestrengthened. If the warp yarn tension is small, a contact area betweenthe warp yarns and the weft yarns in the woven fabric cannot beincreased, and edge comb resistance cannot be obtained to a desirableextent. Further, an effect of reducing the tiny space between the singlefibers is small. If the warp yarn tension is excessively great, the warpyarns tend to produce fluff due to abrasion at heald mails.

As a concrete method of adjusting the warp yarn tension within theabove-described range, a method in which an inserting speed of the weftyarn is adjusted besides adjusting a forwarding speed of the warp yarnof the loom can be cited. Whether the warp yarn tension is actuallywithin the above-described range during weaving can be checked by, forexample, measuring the tension that acts per warp yarn at anintermediate point between the warp yarn beam and a back roller duringoperation of the loom. Further, it is preferable to provide a differencebetween tension of an upper sheet of the warp yarn and tension of alower sheet of the warp yarn at the warp yarn opening.

As an adjustment method, there is, for example, a method in which adifference in a running line length between the upper yarns and thelower yarns is provided by installing a back roller level to, forexample, about 10 to 30 mm higher than a horizontal position and thelike. Further, as another method of providing a difference between thetension of the upper yarns and the tension of the lower yarns, there is,for example, a method in which a cam drive system is adopted in anopening device, and a dwell angle for the other side of the upperyarns/the lower yarns is made 100 degrees greater than that of theother. The tension of the warp yarn with the increased dwell angle ishigher.

Next, if necessary, processing such as scouring, heat set, or the likeis performed after the weaving process.

In the woven fabric woven by using the selvage portion gripping devicefor the loom, occurrence of cloth fell retreat at the selvage portion oroccurrence of the warp yarn looseness in the base cloth selvage portioncan be effectively prevented even in the high-speed weaving. Forexample, even when the loom is operated at high-speed rotation of about400 to 900 rpm, occurrence of the warp yarn looseness in the base clothselvage portion is extremely suppressed. Accordingly, the woven fabriccan be cut into a shape as designed and also easy to sew. Further, sinceoccurrence of the warp yarn looseness in the base cloth selvage portionis suppressed, waste of the woven fabric is small, and the woven fabricis advantageous in terms of cost.

Example

Hereinafter, a configuration and a desired effect will be described indetail by using the following examples.

Measurement Method (1) Total Fineness

Total fineness was obtained by measuring fineness based on correctedmass with a predetermined load of 0.045 cN/dtex according to a JIS L1013:2010 8.3.1 A method.

(2) Number of Single Fibers

Calculation was performed according to a method of JIS L 1013:2010 8.4.

(3) Fineness of Single Fiber

Calculation was performed by dividing the total fineness by the numberof single fibers.

(4) Weaving Density of Warp Yarns/Weft Yarns

Measurement was performed based on JIS L 1096:2010 8.6.1. Each samplewas placed on a flat table, and unnatural wrinkles and tension wereremoved. Then, at five different locations, the numbers of warp yarnsand weft yarns in sections of 2.54 cm were counted, and average valuesfor the warp yarn and the weft yarn were calculated.

(5) Strength/Elongation

Measurement was performed under a constant speed elongation conditionshown in a JIS L 1013:2010 8.5.1 standard time test. Using “TENSILON”UCT-100 made by ORIENTEC Co., LTD, each sample was performed at a gripinterval of 25 cm and a pulling speed of 30 cm/min. Elongation wasobtained from elongation of a point showing the ultimate strength in anS-S curve.

(6) Warp Yarn Tension During Weaving

Using a “Check Master” (registered trademark) (type: CM-200FR) made byKanai Kouki K.K., tension acting per warp yarn in an intermediateportion between the warp yarn beam and the back roller during operationof the loom was measured.

(7) Evaluation of Warp Yarn Looseness in Base Cloth Selvage Portion

As shown in FIG. 5, two marks (102A, 102B) are put on a central portionin a width direction of the woven fabric 10 at an interval of 500 mm.Two lines (103A, 103B) are drawn along the weft yarns from the marks102A, 102B at the respective central portions of the woven fabric in adirection of an end portion 101A at the weft yarn nozzle side of thewoven fabric and in a direction of an end portion 102B at the oppositeside of the weft yarn nozzle of the woven fabric. The end portions 101A,102B are width direction both ends. In this case, the woven condition ofthe woven fabric 10 tends to be loose at both the sides as compared withthe central portion. Accordingly, as shown in FIG. 5, the two lines bendtoward the cloth fell on both the sides, and an interval between the twolines, i.e., the lines 103A, 103B in the direction of the weft yarn,tends to be wider at peripheral portions than the central portion.Therefore, while a distance between the two lines 103A, 103B in the weftyarn direction at the central portion of the woven fabric is 500 mm,when the warp yarn looseness in the base cloth selvage portion becomeslarge, an interval between the two lines 103A and 103B in the directionof the weft yarn becomes wider at the end portion 101A allocated at theweft yarn nozzle side of the woven fabric and the end portion 101Ballocated at a side which is not the weft yarn nozzle side of the wovenfabric. The end portions 101A, 101B are the both sides.

Next, lines, i.e., lines 104A, 104B in the warp yarn direction, aredrawn between the two lines 103A, 103B in the direction of the weft yarnat an interval of 20 mm from the end portion 101A allocated at the weftyarn nozzle side of the woven fabric and from the end portion 101Ballocated at the opposite side of the weft yarn nozzle of the wovenfabric. The end portions are the both sides of the woven fabric. Thewoven fabric is cut along the lines 103A, 103B in the direction of theweft yarn and the lines 104A, 104B in the direction of the warp yarn,thereby obtaining two strip-shaped bodies generated at the end portionsof the woven fabric and having shapes close to rectangles. Lengths inthe warp direction, (i.e., a length direction) of the strip-shapedbodies were measured, and the warp yarn looseness in the base clothselvage portion was evaluated.

Example Warp Yarns/Weft Yarns

Multifilament yarns formed of polyester and having a circular sectionalshape, with single fiber fineness of 2.33 dtex, the number of filamentsbeing 36, total fineness of 84 dtex, no twist provided, strength of 4.21cN/dtex, and elongation of 40% were prepared.

Weaving

Employing the above-described yarns for warp yarns and weft yarns and bya water jet loom equipped with a selvage portion gripping device for aloom, which will be described below, a plain weave fabric was woven withwarp yarn tension during weaving being 20 cN/yarn, loom rotation speedbeing 500 rpm, warp yarn density being 133 yarns/2.54 cm, weft yarndensity being 133 yarns/2.54 cm, and a width (a width of a portion wherethe warp yarns exist) being 200 cm.

As for additional yarns, 3 ply textured yarns formed of polyester andhaving a circular sectional shape, with single fiber fineness of 3.44dtex, the number of filaments being 96 f, and total fineness of 330 dtexwere used. Four additional yarns were supplied and parallelized to eachof the two outsides of the warp yarns where a predetermined number ofyarns were parallelized, and supplied by setting additional yarn tensionto 130 cN/yarn. A clearance of 5 mm was provided between the warp yarnand the additional yarn as a fringe. The fringes of the dischargedselvage portion were gradually separated from the additional yarns, andthe additional yarns were collected in the same route as the catch-cordsat the opposite side of the weft yarn nozzle through a guide.

Selvage Portion Gripping Device for Loom

The selvage portion gripping device for the loom in FIG. 3 includes thespace portion where the selvage portion can pass in which the selvageportion formed by weaving the additional yarns and the weft yarns canpass through in the woven fabric forwarding direction and the tiny spaceportion where the weft yarn can move in which the weft yarn can move inthe woven fabric forwarding direction, and further includes a pair ofplate springs arranged at the space portion where the selvage portioncan pass. The two selvage portion gripping devices for the loom wererespectively installed at the end allocated at the weft yarn nozzle sideand at the end allocated at the opposite side of the weft yarn nozzlenear the reed beating portion of the loom.

A main body of the selvage portion gripping device for the loom 7 ismade of stainless steel and has a rectangular parallelepiped shape (6 mmin width, 30 mm in height, 25 mm in length). As shown in FIG. 3, theselvage portion gripping device for the loom 7 includes the inlet 71A ofthe space where the selvage portion can pass which has a width of 4 mmand a height of 10 mm and the outlet 72A of the space where the selvageportion can pass. Also, the two flexible parts which catch the selvageportion are vertically provided in the space where the selvage portioncan pass. The two flexible parts that catch the selvage portion arerespectively configured by the plate springs 74A, 74B and plate springsupporting bodies 75A, 75B. The plate springs 74A, 74B are respectivelymade of stainless steel having a thickness of 0.3 mm, have thearc-shaped portions at both ends of the flat plate portion having alength of 20 mm, and are fixed to the plate spring supporting bodies75A, 75B by bolts. As a result, a selvage portion gripping length wasset to 20 mm, and a selvage portion gripping width was set to 4 mm. Theselvage portion was configured to be caught so that the selvage portionpasses between the flat plate portions of the pair of plate springssynchronizing with a flow of the woven fabric. Further, as shown in FIG.4, the tiny space where the weft yarn can move and which is allocated atthe weft yarn nozzle side 72A and the tiny space portion where theselvage portion can move and which is allocated at the woven fabric side72B are formed on both the side surfaces of the selvage portion grippingdevice for the loom 7. A widths of these tiny spaces are formed slightlylarger than a diameter of the weft yarn and smaller than a thickness ofthe selvage portion where the weft yarns and the additional yarns arewoven. As a result, the weft yarn moves parallel along the flow of thewoven fabric, and the selvage portion is not slipped out from the tinyspace where the weft yarn can move to the woven fabric side even afterthe weft yarn is cut with the weft yarn cutter.

Comparative Example

Except that the selvage portion gripping device for the loom and theadditional yarns are not used, the weaving was performed according to amethod similar to the method in Example.

Evaluation of Warp Yarn Looseness in Base Cloth Selvage Portion

Hereinafter, the woven fabrics obtained in the Example and ComparativeExample were evaluated according to the above-described evaluationmethod of the warp yarn looseness in the base cloth selvage portion.Lengths of the strip-shaped bodies are shown. As is evident from this,occurrence of cloth fell retreat at the selvage portion of the wovenfabric and the warp yarn looseness in the base cloth selvage portionwere decreased in the woven fabric woven by using the selvage portiongripping device for the loom.

Warp Yarn Looseness at Base Cloth Selvage Portion in Example

L side: 510.5 mm

R side: 512.5 mm

Warp Yarn Looseness at Base Cloth Selvage Portion in Comparative Example

L side: 518.0 mm

R side: 520.0 mm

1-7. (canceled)
 8. A loom on which a weft yarn nozzle, a weft yarncutter, and a selvage portion gripping device are mounted, wherein theselvage portion gripping device comprises a space where a selvageportion can pass in which the selvage portion formed by weavingadditional yarns and weft yarns can pass through in a woven fabricforwarding direction, a tiny space where the weft yarn can move in whichthe weft yarn can pass through, and a device that maintains a wovencondition of the selvage portion even when the weft yarn is cut with aweft yarn cutter, the selvage portion gripping device is only disposedat a weft yarn nozzle side of the woven fabric, or the selvage portiongripping device is disposed both at the weft yarn nozzle side of thewoven fabric and an opposite side of the weft yarn nozzle, when theselvage portion gripping device is disposed at the weft yarn nozzleside, the weft yarn cutter is provided between the weft yarn nozzle andthe selvage portion gripping device, and when the selvage portiongripping device is disposed at the opposite side of the weft yarnnozzle, the selvage portion gripping device is provided between theother weft yarn cutter provided at the opposite side of the weft yarnnozzle and the woven fabric.
 9. The loom according to claim 8, whereinthe device that maintains the woven condition of the selvage portion inthe selvage portion gripping device is an elastic part that catches theselvage portion existing in the space where the selvage portion canpass.
 10. The loom according to claim 9, wherein the elastic part thatcatches the selvage portion is a part formed of a plate spring, or anelastic member and a plate material.
 11. A loom on which a weft yarnnozzle, a weft yarn cutter, and a selvage portion gripping device aremounted, wherein the selvage portion gripping device comprises a spacewhere a selvage portion can pass in which the selvage portion formed byweaving additional yarns and weft yarns can pass through in a wovenfabric forwarding direction, a small space where the weft yarn can movein which the weft yarn can pass through, and an elastic part whichcatches the selvage portion, the selvage portion gripping device is onlydisposed at a weft yarn nozzle side of the woven fabric, or the selvageportion gripping device is disposed both at the weft yarn nozzle side ofthe woven fabric and an opposite side of the weft yarn nozzle, when theselvage portion gripping device is disposed at the weft yarn nozzleside, the weft yarn cutter is provided between the weft yarn nozzle andthe selvage portion gripping device, and when the selvage portiongripping device is disposed at the opposite side of the weft yarnnozzle, the selvage portion gripping device is provided between theother weft yarn cutter provided at the opposite side of the weft yarnnozzle and the woven fabric.
 12. A method of manufacturing a wovenfabric where a predetermined number of warp yarns are parallelized,additional yarns are parallelized on an outside of the parallelized warpyarns, and a weft yarn is supplied to the warp yarns and the additionalyarns, comprising: by using the loom according to claim 8, gripping aselvage portion by a selvage portion gripping device for a loom thatexists in the loom at the time of cutting the weft yarn.
 13. The methodaccording to claim 12, further comprising gradually separating theadditional yarns from the selvage portion discharged from the selvageportion gripping device for the loom.
 14. A method of manufacturing awoven fabric where a predetermined number of warp yarns areparallelized, additional yarns are parallelized on an outside of theparallelized warp yarns, and a weft yarn is supplied to the warp yarnsand the additional yarns, comprising: after the weft yarn is suppliedand the woven fabric is subjected to reed beating, gripping a selvageportion formed by weaving the additional yarns and the weft yarns whenthe weft yarn is cut between the weft yarn at a side where the weft yarnis supplied and the selvage portion formed by weaving additional yarnsand weft yarns.
 15. The method according to claim 14, wherein when theweft yarn at the side where the weft yarn is supplied is further cut,the selvage portion formed by weaving the additional yarns and the weftyarns is gripped between the woven fabric and the cut portion.
 16. Themethod according to claim 14, wherein the additional yarn has a totalfineness larger than total fineness of the weft yarn.
 17. A selvageportion gripping device for a loom mounted on a loom, the selvageportion gripping device comprising: a space where a selvage portion canpass in which the selvage portion formed by weaving additional yarns andweft yarns can pass through in a woven fabric forwarding direction; anda small space where the weft yarn can move in which the weft yarn canpass through, wherein the selvage portion gripping device is onlydisposed at a weft yarn nozzle side of the woven fabric, or the selvageportion gripping device is disposed both at the weft yarn nozzle side ofthe woven fabric and an opposite side of the weft yarn nozzle, when theselvage portion gripping device is disposed at the weft yarn nozzle sideof the woven fabric, a weft yarn cutter is provided between the weftyarn nozzle and the selvage portion gripping device, when the selvageportion gripping device for the loom is disposed at the opposite side ofthe weft yarn nozzle, the selvage portion gripping device is providedbetween the woven fabric and the weft yarn cutter which is allocated atthe opposite side of the weft yarn nozzle and, accordingly, the selvageportion gripping device for the loom comprises a means for maintaining awoven condition of the selvage portion even when the weft yarn is cutwith the weft yarn cutter of the loom.
 18. The selvage portion grippingdevice according to claim 17, further having an elastic part thatcatches the selvage portion.
 19. The method according to claim 12,wherein the additional yarn has a total fineness larger than totalfineness of the weft yarn.
 20. The method according to claim 14comprising gradually separating the additional yarns from the selvageportion discharged from the selvage portion gripping device for theloom.
 21. The method according to claim 20, wherein the additional yarnhas a total fineness larger than total fineness of the weft yarn.